Bearing shell and a radial plain bearing mounted in a bearing ca

Details Bearing shell and a radial plain bearing mounted in a bearing ca Bearing shell and a radial plain bearing mounted in a bearing ca

1997-08-29

1998-08-04

Hannon, Thomas R.

Bearings

Rotary bearing

Plain bearing

384429, F16C 900

Patent

active

057883807

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a bearing shell according to the preamble of claim 1. The invention also relates to a radial plain bearing mounted in a bearing-carrying body provided with a bearing cap, the bearing comprising an upper bearing shell and a lower bearing shell for mounting in internal combustion engines, particularly for the mounting of crankshafts in crankcases and in connecting rods, which are exposed to bearing loading whose magnitude and direction change within a certain cycle, wherein the wall thickness of the lower bearing shell increases from the vertex of the circumference to the joint faces and the inner contour has the shape of a circular arc with the radius r.sub.i.
Such radial plain bearings are used, for instance, in car engines, distinction being made between flange bearings, main bearings and connecting rod bearing. The upper bearing shell is that bearing shell which is situated in a crankcase or in a connecting rod, while the lower bearing shell is mounted in the crankcase cap and is screwed to the upper part. For such bearings are required service lives which correspond to the service life of the car engine. In car engines whose service life is more than 100 000 km, the bearings must often be replaced earlier.
Attempts have therefore been made to obtain, by suitable geometry of the bearing, improved lubrication and thereby longer service life.
From DE-OS 14 25 125 are known multi-shell bearings in which the wall thickness of every shell changes along its length, while the center of the inner diameter of each shell is situated eccentrically to the center of the outer diameter of the shell, and the centre of the inner diameter of each shell lies on the bisector of the angle of the shell circumference. In such bearings, which may be composed of two shells only, the surface of the bearing has not a cross-section in the shape of a circular arc, because in all cases the inner diameters of the shells have no common centre. Every bearing shell has therefore its own radius of curvature which causes jumps in wall thickness at the joint faces. If the wall thicknesses in the region of the joint faces are of the same size, then both the shells of the multi-shell bearing have their maximum thickness in the vertex. In this way a kind of lemon-shaped bore is obtained.
A similar bearing, in which the centers are situated with equal spacing on both sides of the joint face in a radial plane which is twisted through an angle out of the plane of main loading, is known from DE-AS 16 75 743.
From DE-OS 31 36 199 is known to provide the part of the bearing which exhibits greater resistance to deformation with a bearing half-shell in the shape of a circular arc, and the part of the bearing which exhibits a smaller resistance to deformation with an oval bearing halfshell. The bearing shell in the shape of a circular arc has a constant wall thickness, whereas the wall thickness of the oval bearing shell decreases towards the joint faces, so that there is a jump in wall thickness in the region of the joint faces.
U.S. Pat. No. 4,311,349 describes a bearing set comprising two identical bearing shells whose wall thicknesses are reduced in the region of joint faces so that also here a kind of lemon-shaped bore is produced.
From U.S. Pat. No. 4,307,921 is known a bearing in which the wall thickness of the shells in the region of one joint face is greater than in the region of the other joint face. The inner contour of the bearing shells is formed by two superimposed bearing bores with offset centers.
U.S. Pat. No. 4,488,826 describes an eccentric bearing bore in which the eccentrically arranged crank journal has on one side a small clearance and on the other side a large clearance. The center of the eccentric bearing bore is displaced to the region of smaller loading, so that the larger clearance provided there may be used for the supply of lubricant. The two bearing shells, which are identical, have in the region of one joint face a greater wall thickness which continuously decreases in the circumferential direct

REFERENCES:
patent: 1717873 (1929-06-01), Brush
patent: 3249391 (1966-05-01), De Hart et al.
patent: 4307921 (1981-12-01), Roberts
patent: 4311349 (1982-01-01), Roberts
patent: 4461585 (1984-07-01), Mahrus et al.
patent: 4488826 (1984-12-01), Thompson
patent: 5181785 (1993-01-01), Bencini et al.

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